A more appropriate forum to ask questions of this kind is: BlenderBase, or Elysium. However,....I having learned the functionality of 'Shift-T' only recently myself, will happily impart this ancient wisdom unto you, and also because it is not listed in the standard hotkey lists. In your IPO window, select your keyframes in edit mode, press 'shift-T' and choose 'constant'. that means, your object will not fill in any keyframes. another thing you might try in the IPO window is 'R' for 'record mouse'. Hope this works for you.